'The alert, which is also available online, shows that foreign government hackers are still successfully hacking and stealing data from US government’s servers, their activities going unnoticed for years. This comes months after the US government revealed that a group of hackers, widely believed to be working for the Chinese government, had for more than a year infiltrated the computer systems of the Office of Personnel Management, or OPM. In the process, they stole highly sensitive data about several millions of government workers and even spies.

'In the alert, the FBI lists a long series of websites used as command and control servers to launch phishing attacks “in furtherance of computer network exploitation (CNE) activities [read: hacking] in the United States and abroad since at least 2011.”

'Domains controlled by the hackers were “suspended” as of late December 2015, according to the alert, but it’s unclear if the hackers have been pushed out or they are still inside the hacked networks.'